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ISL72991RH
Data Sheet June 2004 FN9054.1
Radiation Hardened Negative Low Dropout Adjustable Voltage Regulator
The radiation hardened ISL72991RH is a low dropout adjustable negative regulator with an output voltage range of -2.25V to -26V. The device features a 1A output current capability, an adjustable current limit pin (ILIM) and a shutdown pin (SD) for easy on/off control. The device incorporates unique circuitry that enables precision performance over the -55C to +125C temperature range and post-irradiation. Specifications include a reference voltage of -1.25V +40mV/-50mV (max), line regulation of 25mV (max), and load regulation of 15mV (max). Constructed with the Intersil dielectrically isolated Rad Hard Silicon Gate (RSG) BiCMOS process, these devices are immune to Single Event Latch-up and have been specifically designed to provide highly reliable performance in harsh radiation environments. Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed here must be used when ordering. Detailed Electrical Specifications for these devices are contained in SMD 5962-02503. A `hotlink' is provided on the Intersil website for downloading.
Features
* Electrically Screened to DSCC SMD # 5962-02503 * QML Qualified per MIL-PRF-38535 Requirements * Radiation Environment - Total Dose (Max) . . . . . . . . . . . . . . . . . . . . 300krad(SI) - Latch-Up Immune * Line Regulation . . . . . . . . . . . . . . . . . . . . . . 25mV (max) * Load Regulation . . . . . . . . . . . . 12mV (typ); 15mV (max) * Output Voltage Range . . . . . . . . . . . . . . . . -2.25V to -26V * Dropout Voltage (100mA). . . . . . . . 0.2V (typ); 0.3V (max) * Dropout Voltage (1A) . . . . . . . . . . . . . . . . . . . . . .1V (max) * Minimum Load Current. . . . . . . . . . . . . . . . . . . . . . .3.0mA * TTL Input-Level Shutdown (SD); Low = On
Applications
* Switching Power Supplies * DC/DC Converters * Motor Controllers
Ordering Information
ORDERING NUMBER INTERNAL MKT. NUMBER ISL72991RHVF ISL72991RHQF ISL72991RHVX ISL72991RHF/Proto TEMP. RANGE (C) -55 to 125 -55 to 125 -55 to 125 -55 to 125
Pinout
ISL72991RHF (FLATPACK CDFP3-F28) TOP VIEW
5962F0250301VXC 5962F0250301QXC
VIN VIN NC NC NC NC NC NC NC NC GND ILIM VOUT VOUT
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
VIN VIN NC NC NC NC NC NC NC NC ADJ SD VOUT VOUT
5962F0250301V9A ISL72991RHF/Proto
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2002, 2004. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL72991RH Application Information
Typical User Application:
VIN
VIN ILIM SD GND VOUT
Capacitor Selection
VOUT
ISL72991RH
ADJ
An input capacitor is required if the regulator is located more than 6 inches from power supply filter capacitors. A 10F solid tantalum capacitor is recommended. An output capacitor of at least 10F must be used to insure stability of the regulator. Additional capacitance may be added as required to improve the dynamic response of the regulator. Solid tantalum and/or ceramic capacitors are recommended.
RCL
CIN
R2
FIGURE 1. TYPICAL APPLICATION SCHEMATIC
R1
CC
COUT
Output Voltage Programming
The output voltage of the regulator can be programmed with two external resistors and is described by the following equation: VOUT = VREF x (1+R2/R1) - (IADJ x R2).
Loop Compensation
The output capacitor and ESR comprise a zero in the loop transfer function that must be compensated with a pole to insure loop stability in accordance with the following equation: CC x R2 = COUT x ESR. The compensating capacitor should be a low ESR ceramic type.
Output Current Limit Programming
The output current limit threshold of the regulator can be programmed with a single external resistor connected from ILIM to ground. The current flowing into the ILIM pin is described by the following equation: ILIM = 1V/(RCL + 2400). The graph below shows the relationship between ILIM and the output current limit threshold, IOUT_LIM.
Layout Guidelines
The stability of the regulator is sensitive to layout. It is strongly recommended that a continuous copper ground plane (1 ounce or greater) be used. In addition, component lead lengths and interconnects should be minimized, but should not exceed 1/2 inch. Finally, the return lead of the compensation capacitor (CC) should be connected as close as possible to the GND pin of the IC.
IOUT_LIM (A)
ILIM (A)
FIGURE 2. IOUT_LIM vs ILIM
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ISL72991RH Die Characteristics
DIE DIMENSIONS: 5870m x 5210m (231.1mils x 205.1mils) Thickness: 483m 25.4m (19mils 1mil) INTERFACE MATERIALS: Glassivation: Type: PSG (Phosphorous Silicon Glass) Thickness: 8.0kA 1.0kA Top Metallization: Type: AlSiCu Thickness: 16.0kA 2kA Substrate: Radiation Hardened Silicon Gate, Dielectric Isolation Backside Finish: Silicon ASSEMBLY RELATED INFORMATION: Substrate Potential: Unbiased (DI) ADDITIONAL INFORMATION: Worst Case Current Density: <2.0 x 105 A/cm2 Transistor Count:
Metallization Mask Layout
ISL72991RH
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 3

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